Hot-air-furnace casing



June 10 1924. F. ANDREAS HOT. AIR FURNACE CASING Filed Dec. 17. 1923 Patented June 10, 1%24.

FREDERICK ANDREAS,

sonar.

on ST. LOUIS, Missounr, assrenon TO BRIDGE & BEACH MANUFACTURING COMPANY, on ST. Louis, MISSOURI, A CORPORATION or MIS- HOT-AIR-FUBINACE CASING.

hpplication filed December 17, 1923. Serial No. 681,266.

' To all whom it may concern Be it known that I, FREDERICK ANDREAS, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain 5 new and useful Improvement in Hot-Air- 'Furnace Casings, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to hot air furnace casings of the type that comprise an inner sheet metal lining spaced away from acylindrical shell or casing so as to form a'dead air space.

The cylindrical shell or casing is usually formed from a number of sections, arranged one above the other, with a horizontallydisposed ring interposed between said sections, and the inner lining is suspended from said ring by means of inwardly-projecting arms on the ring, then enter holes in the inner lining. In prior furnace casings of this general type the inwardly-projecting arms that sustain said lining are rigidly connected to the ring that forms part of the casing which surrounds the inner'lining. Consequently, in erecting the furnace casing it is necessary to temporarily position the inner lining inside of the casing, mark said inner lining at the points where the arms on the ring are located, then remove said inner lining from the casing and punch holes in same for said arms and thereafter restore the inner lining to its former position inside of the 36 casing and suspend it from said ring by inserting the arms thereon in the holes in the casing.

The object of my invention is to simplify the operation of erecting furnace casings 40 of the general type referred to. V

, To this end I have devised a furnace casing in which the ring that forms part of the casing which surrounds the inner lining is provided with arms'that can be adjusted circumferentially of said ring so as to bring them into alignment with elements on the inner lining that co-operate with said arms to sustain the inner lining. In erecting the furnace, the sheetthat constitutes the inner lining is first provided with elements that are adapted to co-operate with the arms that sustain said inner lining, said sheet is then arranged inside of the casing, and thereafter the arms on the ring that forms part of the casing are adjusted so as to bring *ways and lining C in various ways without departing them into alignment withtheir co-operating' elements on the inner lining. By constructing the furnace casing in this manner I simplify the operation of erecting the furnace, owing to the fact that it is not necessary to temporarily position the inner lining inside of the casing, accurately mark said lining at the points where the sustaining armsare to engage same, then remove said inner lining and form elements on same to co-operate with the sustaining arms, and thereafter restore said inner lining to its former position.

Figure 1 of the drawings is a perspective v1e w, illustrating aportion of the inner lining and a portion of the ring that forms part of the cylindrical shell or casing which surrounds the inner lining.

Figure 2 is a top plan view of a portion of said ring, showing one of the adjustable arms on the ring.

Figure 3 is a vertical sectional View of said ring, showing one of the arms on same arranged in operative relationship with the inner lining; and

Figure 4 is a perspective view of a furnace casing, broken away so as to show the relative position of the inner lining, the casing that surrounds same and the adjustable arms that sustain the inner lining and hold it in spaced relation with the surrounding casing.

Referring to the drawings which illustrate the preferred form of my invention, A designates a number of cylindrical members, arranged one above the other and combined with horizontally-disposed rings B so as to form a cylindrical shell or casing that surrounds an inner sheet metal lining'C that is suspended from said rings and held in spaced relation with said casing by arms D that project inwardly from the rings B and engage elements 1 on the inner lining C, here in illustratedas holes in said inner lining.

The inner lining G is preferably composedof a number'of'sections, each of which is suspended from arms D on one of the rings of the shell or casing A. Instead of rigidly connecting the arms D to the rings B which support said arms, the arms Dof my improved furnace are so constructed and come bined with their supporting rings that they can be adjusted circumferentially of same. The arms D can be constructed in various can be combined with the inner from the-spirit of my invention, but I prefer to use arms D of the kind herein illustrated, each of which is provided with a horizontally-disposed portion 2 that proj ects inwardly from the ring B, two parallel, vertically-disposed portions 3 that project downwardly from the horizontally-disposed portion 2 and embrace the upper edgeportion of the supporting ring B, and a part a at the inner end of the horizontally disposed portion 2 that is adapted to be inserted in a Fhole l-in the inner lining C. The arm D canbe formed conveniently from a piece of sheet metal thatis slit and bent in such a way as to form a member that can be easily slipped over the upper edge of the ring 8 and thereafter adjusted circumferentially of said ring into any desired position. The

particular shape or construction of the part 1 at the inner end' of the horizontally-disiposed'porti'on 2 of the arm that co-operates directly with the inner lining is immaterial,

-"so farias my broad idea is concerned, but 'when the arm D is formed from a 1 sheet 'metal'stamping, as 'hereinillustrated, it is T preferable to sever the horizontally-disposed portion 2 of the arm and then bend the severed portion vertically or into an uprightpositiom'so'as to form an upwardlyextending projection at the innerend of the arm that can be inserted in one of the holes 1 in the inner lining, the terminal end of the horizontally-disposed portion 2 of the arm being bent downwardly at 5, as shown more clearly in FigureS, so as to form a portion on the arm that holds the inner lining in spaced relation with the casing which surrounds said inner lining.

In erecting the furnace the cylindrical members A and rings B that constitute the shell or casing which surrounds the inner lining are first assembled and thereafter sheet metal plates provided with holes 1 are arranged inside of said casing so as to form the inner lining C, the arms D on the rings B being'adjusted circumferentially of said rings so as to arrange them opposite the holes 1 in the inner lining, and thus permit the pro jections i on said arms to be inserted in said holes, thereby causing the inner lining to be supported on the arms D and maintained in spaced relation with-the casing which surrounds same.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A hot air furnace casing provided with a horizontally-disposed ring, an inner sheet metal lining arranged inside of said casing, circumferentially-adjustable arms on said ring that project inwardly from same, and elements on said inner lining that are engaged by said arms.

- 2. A hot air'furnace casing having-asheet metal lining arranged inside of said casing,

openings in said lining, and adjustable supporting members on said casing that are adapted to be inserted in the openings in said lining so as to sustain the same.

3. A hot air furnace casing having an inner lining constructed from sheet metal, holes in said lining that are formed in same before arranging said lining inside of the casing, and adjustable elements on the casing that project into the holes in said lining and thus sustain the said lining and hold it in spaced relation with the casing.

4. A hot furnace casing provided with a horizontally-disposed ring, an inner sheet metal lining arranged inside or said casing and provided with holes, and circumferentially adjustable arms on said ring that project inwardly from same and enter the holes in said inner lining.

5. A hot air furnace casing provided with a horizontally-disposed ring, an inner sheet metal lining arranged inside of said casing and provided with holes, circumferentially adjustable arms on said ring that project inwardly from same and enter the holes in said inner lining, and portions on said arms that co-operate with the lining to hold it in spaced relation with the casing.

6. A hot air furnace casing provided with a horiZontally-disposed ring, an inner sheet metal lining arranged inside of said casing and equipped with holes that areiormed in same prior to positioning the lining in the casing, and circumferentially adjustable arms on said ring that enter the holes in said lining and thus sustain same, each of said arms comprising a horizontally-disposed portion projecting inwardly from the ring and provided at its outer end with parts that embrace the upper edge portion of the ring.

7. A hot air furnace casing provided with a horizontally-disposed ring, an inner sheet metal lining arranged inside of said casing and equipped with holes that are formed in same prior to positioning the lining in the casing, and circumferentially adjustable arms on said ring that enter the holes in said lining and thus sustain same, each of said arms comprising a horizontally-disposed port-ion provided at one end with parts that embrace the upper edge portion of said ring and provided at its opposite end with an upwardly-projecting part that is adapted to be inserted in one of the holes of said inner lining.

8. A hot air furnace casing provided with a horizontally-(iisposed ring, a sheet metal inner lining arranged inside of'saidcasing and provided with holes, and circumferentially adjustable arms slidingly mounted on the upper ed e portion of said ring and each provided with one part that enters a hole in said inner lining and another part that bears against said inner lining and holds it in spaced relation with the casing.

9. A hot air furnace easing provided with stamping having a horizontally-disposed a horizontally-disposed ring, an inner lining portion provided at one end with parallel, arranged inside of said casing and convertically-disposed parts that embrace the structecl from sheet metal plates provided upper edge portion of the ring and provided 5 With holes that are formed in same prior to at its opposite end with a depending terarranging said plates inside of the casing, ininal portion that bears against the inner and eireumferentially adjustable arms on lining and anupvvardly-projeeting portion said ring that project inwardly from same that enters one of the holes in said lining. and enter the holes in said inner lining, each 10 of said arms consisting of a sheet metal FREDERICK ANDREAS. 

